EP3191878B1 - Beleuchtungsvorrichtung - Google Patents

Beleuchtungsvorrichtung Download PDF

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Publication number
EP3191878B1
EP3191878B1 EP15753110.4A EP15753110A EP3191878B1 EP 3191878 B1 EP3191878 B1 EP 3191878B1 EP 15753110 A EP15753110 A EP 15753110A EP 3191878 B1 EP3191878 B1 EP 3191878B1
Authority
EP
European Patent Office
Prior art keywords
light
microstructures
light guide
face
luminous device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15753110.4A
Other languages
English (en)
French (fr)
Other versions
EP3191878A1 (de
Inventor
Maryline Thorailler
Stéphane Bombard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Systemes Thermiques SAS
Original Assignee
Valeo Systemes Thermiques SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques SAS filed Critical Valeo Systemes Thermiques SAS
Publication of EP3191878A1 publication Critical patent/EP3191878A1/de
Application granted granted Critical
Publication of EP3191878B1 publication Critical patent/EP3191878B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
    • B60Q3/14—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards lighting through the surface to be illuminated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
    • B60Q3/16—Circuits; Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/60—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects
    • B60Q3/62—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects using light guides
    • B60Q3/64—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects using light guides for a single lighting device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
    • G02B6/0006—Coupling light into the fibre
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
    • G02B6/0008—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted at the end of the fibre
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the present invention relates to a light device, in particular for a motor vehicle.
  • the invention also relates to a module dome of a motor vehicle comprising a light device according to the invention.
  • the most commonly used light sources are typically light-emitting diodes which are monochromatic with relatively limited color varieties available.
  • Polychromatic light emitting diodes exist, but they are generally very expensive and offer little choice in terms of power.
  • These devices use semi-reflective blades to mix the beams from each light source.
  • This type of device has a fragility and a size that may be incompatible with use as a light in a motor vehicle.
  • pointed-shaped microstructures make it possible to disperse the incident light rays in different directions so as to produce a relatively homogeneous mixture of the rays coming from the two light sources at the outlet face of the guide.
  • pointed shapes minimize the number of light rays reflected at the entrance surface.
  • the tip of the microstructures of the input face is oriented perpendicular to the general orientation of the input face
  • the tip of the microstructures of the input face is oriented towards the light sources.
  • This arrangement makes it possible to obtain very different angles of reflection in a restricted area regardless of the angle of incidence of the light rays.
  • the microstructures of the entrance face of the light guide are adjacent to each other.
  • the microstructures are identical and form a network.
  • the ratio between the width of the bases of the microstructures of the entrance face of the light guide and the distance between the light sources and the entrance face of the light guide is less than or equal to at 0.07.
  • Such a ratio makes it possible to limit the opening angle to 4 ° so as to limit the difference in incidence of the rays coming from the different light sources.
  • the distance between the light sources and the entrance face of the light guide is between 2 and 4 mm.
  • the microstructures of the entrance face of the light guide have a pyramidal shape.
  • the microstructures of the entrance face of the light guide have a tetrahedral shape.
  • the microstructures of the entrance face of the light guide have a conical shape.
  • At least one lens is placed on the exit face so as to orient the light beam from the light guide.
  • the at least two light sources are grouped in a multi-chip light emitting diode.
  • the multi-chip light emitting diode comprises three chips emitting respectively the colors red green and blue.
  • Such a diode makes it possible to obtain a white light at the exit of the light guide.
  • the present invention also relates to a module dome of a motor vehicle comprising a light device.
  • the invention relates to a light device 1 comprising two light sources or light sources 3a and 3b and a light guide 5 configured to transmit the light rays represented here by arrows 7 of its input face 5a located opposite the two light sources 3a and 3b at its outlet face 5b located at the opposite end to the input face 5a.
  • the light guide 5 is rectilinear in shape, for example cylindrical, however the present invention is not limited to a rectilinear light guide 5 or a light guide 5 of circular section but also extends to light guides 5 of polygonal section or non-rectilinear light guides, for example curved or flexible.
  • the light guide 5 may also include lateral fins 11 for fixing it and which may be made of material with the light guide 5.
  • the two light sources 3a and 3b are positioned next to each other, for example adjacent or close to each other and close to the axis 6 of the light guide 5 so as to maximize the number of light rays 7 transmitted to the input face 5a of the light guide 5.
  • the two light sources 3a and 3b are also of different colors, that is to say that the wavelengths of the light rays they emit are different.
  • these wavelengths are distinct and correspond to a predefined range of the visible spectrum such as, for example, the interval 380 to 450 nm for the violet color or the range 620 to 670 nm for the Red color.
  • the present invention is not limited to two light sources 3a and 3b but also extends to a larger number of light sources, the number of light sources being preferably limited by the size of the light source. 5a of the light guide 5 and the size of the light sources so that the light rays from the light sources are transmitted by the light guide 5.
  • the light sources are arranged centrally with respect to the face of the light entry 5a.
  • the light sources 3a and 3b are, for example, light-emitting diodes and can be positioned on a common substrate.
  • the light sources 3a and 3b are grouped in a multi-chip LED emitting light rays of different colors, for example red, green and blue. Indeed, in the case where we want to recover a white light output of the light guide 5, the use of three light sources of red, green and blue provides a relatively white light when one mix the three corresponding radiations.
  • the light guide 5 is made of transparent material, for example clear plastic material without diffusion such as crystal polycarbonate or with a slight diffusion such as slightly milky polycarbonate.
  • the light guide 5 has a generally elongated, rectilinear shape in the case of the figure 1 and comprises an inlet face 5a at a first end and an outlet face 5b at its opposite end.
  • the inlet face 5a comprises a plurality of microstructures 9 of pointed form whose tips are oriented perpendicularly to the general orientation of the entry face 5a and are directed towards the outside of the light guide 5, it is to the light sources 3a and 3b (not shown on the figure 2 ).
  • These microstructures 9 make it possible to diffuse the incident light rays 7 in very different and very varied directions whatever their angle of incidence.
  • two rays arriving perpendicularly to the general orientation of the input face such as for example the rays 7a and 7b of the figure 1 can be refracted in totally different by the input face 5a depending on the orientation of the microstructure portion 9 on which they are refracted so that their path within the light guide 5 may be very different and their position on the exit face 5b can also be very different.
  • the microstructures 9 may be of pyramidal or tetrahedral shape, the number of faces of the microstructure may be greater than or equal to four or also of conical shape.
  • the microstructures are positioned adjacent, that is to say that they have a portion of their common base with at least one other microstructure 9.
  • the adjacent microstructures 9 have for example a common edge in the case of pyramidal or tetrahedral microstructures and their base truncated so as to have a common edge in the case of conical microstructures. This configuration makes it possible to have no flat surfaces between the microstructures.
  • the microstructures 9 will preferably have the same size and the same height, however slightly different microstructure sizes can also achieve the desired result.
  • microstructures 9 are identical and are distributed in an adjacent and regular manner on the input face and thus form a network of microstructures 9.
  • FIGS. 3 and 4 show in detail an example of an input face comprising an array of microstructures 9 of cube-corner tetrahedral shape.
  • microstructures 9 are for example obtained by laser cutting or plastic injection.
  • the microstructures 9 make it possible to refract the incident light rays 7 in various very different directions as a function of the orientation of the microstructure portion 9 on which a light ray 7 arrives, which makes it possible to distribute the light rays 7 coming from the different light sources on the entire output face 5b of the light guide and thus to achieve a mixture of light rays 7 from different light sources 3a, 3b.
  • One or more lenses may also be placed at the outlet face 5b of the light guide 5 to orient the light beam, for example to focus it in a specific direction or on the contrary to spread it over an enlarged area.
  • These lenses are for example Fresnel lenses.
  • the opening angle of the microstructures 9 must remain low.
  • the size of the microstructures 9 and the spacing between the light sources 3a, 3b and the input face 5a of the light guide 5 will be chosen so that the ratio between the width of the bases of the microstructures 9 of the face 5a input of the light guide 5 and the distance between the light sources 3a, 3b and the input face 5a of the light guide 5 is less than or equal to 0.07.
  • the opening angle remains below 4 °.
  • This angle must not be too small to allow a good distribution of the light rays 7 from the different light sources 3a and 3b on the input face of the light guide 5.
  • the height of the microstructures 9 will for example be between 0.2 and 0.4 mm while the distance between the light sources 3a, 3b and the input face 5a may be between 2 and 4 mm.
  • the diameter of the light guide 5 is for example between 2 and 4 mm.
  • the tip of the microstructure allows to deflect the most intense light direction of each LED.
  • this pointed shape allows to deflect the central peak of light intensity of each LED.
  • the angle of the tip of the microstructure is less than or equal to 90 degrees to obtain the greatest possible number of deviated rays and thus mixed.
  • the light rays 7 coming from a light source 3a, 3b are distributed over the whole of the exit face 5b of the light guide.
  • light 5 relatively homogeneously.
  • the use of several light sources 3a, 3b thus makes it possible to obtain a superposition of the light rays 7 coming from the different light sources 3a, 3b over the whole of the exit face 5b.
  • These light sources 3a, 3b having different colors the light beam obtained at the exit of the light guide 5 corresponds to a beam whose color corresponds to the superposition of the colors of the light sources 3a, 3b.
  • the colors of the light sources 3a, 3b it is possible to obtain a light beam of the desired hue.
  • the use of three sources of red, green and blue light thus makes it possible to obtain a relatively homogeneous beam of white light.
  • This beam can then be used to illuminate a particular element.
  • the light device described above can be installed in a module dome located above the center console to illuminate the center console or a particular element of the center console.

Claims (13)

  1. Leuchtvorrichtung (1), welche umfasst:
    - wenigstens zwei Lichtquellen (3a, 3b) von unterschiedlicher Farbe,
    - einen Lichtleiter (5), der eine Eintrittsfläche (5a) und eine Austrittsfläche (5b) umfasst und dafür ausgelegt ist, die Lichtstrahlen (7), die von den wenigstens zwei Lichtquellen (3a, 3b) ausgehen, von seiner Eintrittsfläche (5a) zu seiner Austrittsfläche (5b) zu übertragen,
    dadurch gekennzeichnet, dass
    die wenigstens zwei Lichtquellen (3a, 3b) nebeneinander angeordnet sind, und dadurch, dass der Lichtleiter (5) mehrere Mikrostrukturen (9) von spitz zulaufender Form umfasst, die auf seiner Eintrittsfläche (5a) verteilt sind, wobei die Spitzen der Mikrostrukturen (9) der Eintrittsfläche (5a) senkrecht zur allgemeinen Ausrichtung der Eintrittsfläche (5a) ausgerichtet sind.
  2. Leuchtvorrichtung nach Anspruch 1, wobei die Spitze der Mikrostrukturen (9) der Eintrittsfläche (5a) zu den Lichtquellen (3a, 3b) hin ausgerichtet ist.
  3. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei die Mikrostrukturen (9) der Eintrittsfläche (5a) des Lichtleiters (5) einander benachbart sind.
  4. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei die Mikrostrukturen (9) identisch sind und ein Netz bilden.
  5. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei das Verhältnis zwischen der Breite der Grundflächen der Mikrostrukturen (9) der Eintrittsfläche (5a) des Lichtleiters (5) und dem Abstand zwischen den Lichtquellen (3a, 3b) und der Eintrittsfläche (5a) des Lichtleiters (5) kleiner oder gleich 0,07 ist.
  6. Leuchtvorrichtung (1) nach Anspruch 5, wobei der Abstand zwischen den Lichtquellen (3a, 3b) und der Eintrittsfläche (5a) des Lichtleiters (5) zwischen 2 und 4 mm liegt.
  7. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei die Mikrostrukturen (9) der Eintrittsfläche (5a) des Lichtleiters (5) eine Pyramidenform aufweisen.
  8. Leuchtvorrichtung (1) nach einem der Ansprüche 1 bis 6, wobei die Mikrostrukturen (9) der Eintrittsfläche (5a) des Lichtleiters (5) eine Tetraederform aufweisen.
  9. Leuchtvorrichtung (1) nach einem der Ansprüche 1 bis 6, wobei die Mikrostrukturen (9) der Eintrittsfläche (5a) des Lichtleiters (5) eine konische Form aufweisen.
  10. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei wenigstens eine Linse auf der Austrittsseite (5b) angeordnet ist, um das von dem Lichtleiter (5) ausgehende Lichtbündel auszurichten.
  11. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei die wenigstens zwei Lichtquellen (3a, 3b) in einer Multi-Chip-Leuchtdiode gruppiert sind.
  12. Leuchtvorrichtung (1) nach Anspruch 11, wobei die Multi-Chip-Leuchtdiode drei Chips umfasst, die Licht von toter, grüner bzw. blauer Farbe aussenden.
  13. Deckenmodul eines Kraftfahrzeugs, welches eine Leuchtvorrichtung (1) nach einem der Ansprüche 1 bis 12 umfasst.
EP15753110.4A 2014-07-16 2015-07-16 Beleuchtungsvorrichtung Active EP3191878B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1401583A FR3023901B1 (fr) 2014-07-16 2014-07-16 Dispositif lumineux
PCT/FR2015/051958 WO2016009156A1 (fr) 2014-07-16 2015-07-16 Dispositif lumineux

Publications (2)

Publication Number Publication Date
EP3191878A1 EP3191878A1 (de) 2017-07-19
EP3191878B1 true EP3191878B1 (de) 2018-12-26

Family

ID=51688116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15753110.4A Active EP3191878B1 (de) 2014-07-16 2015-07-16 Beleuchtungsvorrichtung

Country Status (3)

Country Link
EP (1) EP3191878B1 (de)
FR (1) FR3023901B1 (de)
WO (1) WO2016009156A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109143449B (zh) * 2017-06-15 2021-03-26 市光法雷奥（佛山）汽车照明系统有限公司 光导装置、照明装置及机动车辆

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324037B4 (de) * 1993-07-17 2006-07-13 Itt Automotive Europe Gmbh Signalleuchte, insbesondere für Kraftfahrzeuge
JP2012248293A (ja) * 2011-05-25 2012-12-13 Japan Display East Inc バックライト及び表示装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2016009156A1 (fr) 2016-01-21
EP3191878A1 (de) 2017-07-19
FR3023901B1 (fr) 2016-09-02
FR3023901A1 (fr) 2016-01-22

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